Clamp.



PATENTED JUNE 5, 1906.

W. SGHNURR.

CLAMP.

APPLICATION FILED SEPT.15. 1905.

- uvawtoz Witncaaco va- 1, 41% a 2m WILLIAM SOHNURR, OF

NEW YORK, N. Y., ASSIGNOR TO THE UNITED STATES PRINTING COMPANY, OFCINCINNATI, OIIIO, A CORPORATION OF OHIO.

Specification of Letters Patent.

CLAMP.

Patented June 5, 1906.

Applica ion file September 15, 1906. Serial No. 278,660.

To all whom it may concern:

Be it known that I, WILLIAM SOIINURR, of New York, in the county ofKings and State of New York, have invented certain new and usefulImprovements in Clamps; and I do hereby declare the followin to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The object of my invention is to provide improvements in ploying meansfor adjustablysecuring the clamp as an entirety to a table, andindependent means for holding the work to be operated upon.

When used upon metal-trimming machines in the making of electroplateswhere a number of such plates must have their corresponding ed es cutprecisely alike, it is essential that the clamps shall not only be enipped with means for holding the work,

w lch may be tightened and released independently of the means forsecuring the clamp to the table-bed, but it is also neces-- sary thatthe clam as an entirety be evenly balanced and eapa le of niceadjustment to securely hold it in its adjusted positions. Furthermore,it is essential when a series of superposed plates is to be cut that theelement iolding the work be moved into engagement therewith in a trulyvertical plane, so as to avoid the possibility of the plates being movedrelatively to each other. Where this holding element in its adjustmentmoves in an are, there is a pulling or pushing action upon the plateswhich tends to destroy their a inement. These plates are expensive, andas the greatest care is necessary in makin them of exactly correspondingsize an formation the effectiveness of the clamps becomes an importantfactor in their manu facture.

In the accompanyin drawings, Figure 1 is a perspective view s owingportion of a metal-trimming machine equipped with clamps embodying myinvention, the clamps being illustrated holding a series of plates. Fig.2 is a side elevation, partly in section, of the clam and table.

Referring to the drawings, 1 designates the bed of a metal-trimmingmachine desi ned, as

usual, to be moved on tracks 2 for t e purpose of placing the materialto be operated that class of clamps emu on in engagement with a rotarycutter 3.

1e bed is shown formed with a plurality of transverse grooves 4, whichare of inverted- T shape beneath the surface of the bed.

5 designates the clamp. This is shown consisting of a casting having abase portion 6, at or near one end of which is a vertical post 7. Fromthe top of the latter to the other end of the base extends an arm orbrace 8. The base portion is of greater width than oove 4 of the tableover which it is designe to be placed and is of such size that it willprovide a firm setting or bearing for the clamp upon the table.

9 is a rod freely movable in the bore of the central portion or post 7of the casting and extending through the latter and the base 6 andhaving at its lower extremity a rectangular head 10, designed to beaccommodated by the inverted-T grooves 4 of the table. By means of awing-nut 12 engaging the threaded end of the rod 9 the latter may betightened to secure the clamp to the table.- When this is done, theextent of bearing-surface of the base of the clamp upon the tableinsures the binding force holding the casting as against possibility ofaccidental displacement.

Extending forwardly from the post 7 is a horizontal arm 13 of suchlength that it and its complementary parts will about counterbalance theportion of the clamp at the opposite side of the post-that is, base 6and brace 8.

14 is a rod threaded in the free end of arm 13, controlled by ahand-wheel 15, and carrying at its lower extremity a presser-foot 16.The connection between this rod and the presser-foot is a swivel-joint17, so that the presser-foot will be caused to securely hold metal orother work the upper face of which may be irregular or slanted. On thelower face of the presser-foot I have provided a cushion 18.

In practice a series of clamps may be placed in any desired positionupon a table that is to say, they may be moved to any point longitudinaly of the grooves 4; or turned axially until their respective presserfeetare at the desired points over the work. U on tightening wing-nuts 12the clam )8 W111 be firmly held in position, and the presser-feet maythen be brought into ongagement with the work. It is obvious that theseresser-feet may be released Without affectin the adjustment of the clamprelative to the table.

From the foregoing it will be seen that the objects of my invention arefully attained. The clamp as an entirety is firmly held to the bed andis evenly balanced. The presserfeet move in a vertical plane andeffectively hold the series of superposed plates.

I claim as my invent1on In a clamp, a frame or casting having a Vertical0st formed with a central bore, a rod freel movable in said boreextending above the to of said post and threaded at its upper en saidrod having an adjustingnut on such upper end and having a rectangularhead at its lower extremity for the purpose stated, a base extendingfrom one side of said post, and an arm rejecting laterall from theopposite side of said post, a vert1 cally-adjustable rod in the free endof said arm, a resser-foot carried by the lower extremity of said rod,and a swivel-joint connecting said resser-foot and said rod.

In testimony whereof I have signed this specification in the presence oftwo subscribmg witnesses.

WILLIAM SCHNURR.

